72185717 has 2 divisors, whose sum is σ = 72185718. Its totient is φ = 72185716.

The previous prime is 72185713. The next prime is 72185719. The reversal of 72185717 is 71758127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47969476 + 24216241 = 6926^2 + 4921^2 .

It is a cyclic number.

It is not a de Polignac number, because 72185717 - 2² = 72185713 is a prime.

Together with 72185719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72185713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36092858 + 36092859.

It is an arithmetic number, because the mean of its divisors is an integer number (36092859).

Almost surely, 2^72185717 is an apocalyptic number.

It is an amenable number.

72185717 is a deficient number, since it is larger than the sum of its proper divisors (1).

72185717 is an equidigital number, since it uses as much as digits as its factorization.

72185717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27440, while the sum is 38.

The square root of 72185717 is about 8496.2178055886. The cubic root of 72185717 is about 416.3741491062.

The spelling of 72185717 in words is "seventy-two million, one hundred eighty-five thousand, seven hundred seventeen".